toJson method
Implementation
Map<String, dynamic> toJson() {
final Map<String, dynamic> json = <String, dynamic>{};
json['type'] = "card";
json['number'] = number;
json['expiry_month'] = expiryMonth;
json['expiry_year'] = expiryYear;
json['cvv'] = cvv;
json['name'] = name;
json['billing_address'] = billingAddress?.toJson();
json['phone'] = phone?.toJson();
return json;
}